Development of anti-corrosion technique of CFRP strengthened steel structures and durability prediction under atmospheric environment

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K15074
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 22020:Structure engineering and earthquake engineering-related
• Research Institution: Kyushu University
• Principal Investigator: Yang Muye 九州大学, 工学研究院, 特任助教 (70836519)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: galvanic corrosion / CFRP / adhesion / thermal analysis / durability / mechanics

Outline of Final Research Achievements

The study focused on the CFRP strengthening technique applied to the corroded steel structures, committed to improving the environmental durability of adhesion interface and composite joint. It was aimed to evaluate the bond behavior and galvanic corrosion mechanism of the CFRP-steel bonding system through comprehensive research methods. Firstly, mechanical and thermal analysis optimized the curing condition and other variables during fabrication. Secondly, the moisture and thermal effects on the deterioration of CFRP-steel adhesive joint were discussed by conducting aging tests. Meanwhile, the conventional rust removal methods were studied by clarifying the physical and chemical characteristics of steel surfaces. Finally, an electrolytic film thickness measuring device was developed to simulate the atmospheric environment. The test results show that the water film and immersion environments can cause different corrosion rates and anodic zone.

Free Research Field

工学

Academic Significance and Societal Importance of the Research Achievements

The present experimental results provide new insights regarding the interfacial bond mechanism between corroded steel structures and adhesive or CFRP composites to enhance their capability for use in aging steel structures in various fields.